K&N manufactures two replacement air filters designed for use on the Pro-M mass airflow sensor. These filters have studs in the mounting flange that match the pattern of the sensor. The two filters differ in that the E-3020 height is 5 1/2 inches and the E-4910 height is 9 1/8 inches. K&N replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for virtually every vehicle on the road.